Color measurement of the mucous membrane using sequential endoscopic images

Shin-ichiroh Kitoh; Takashi Obi; Masahiro Yamaguchi; Nagaaki Ohyama

doi:10.1117/12.274084

25 April 1997 Color measurement of the mucous membrane using sequential endoscopic images

Shin-ichiroh Kitoh, Takashi Obi, Masahiro Yamaguchi, Nagaaki Ohyama

Proceedings Volume 3034, Medical Imaging 1997: Image Processing; (1997) https://doi.org/10.1117/12.274084
Event: Medical Imaging 1997, 1997, Newport Beach, CA, United States

Abstract

In order to give medical doctors objective information of the internal surface of the organs, which will lead to an improvement of the quality of the endoscopic diagnosis, it is necessary to develop a method to quantitatively measure colors from the digital images of CCD endoscope. However, when the internal surface of the human digestive organs is illuminated by the light of the endoscope, images captured by the endoscope become reddish compared to the original object due to the reflections by the surrounding red mucosal surface. This phenomenon makes it difficult to measure the object color correctly. We propose a method to compensate the color shift of illumination and to estimate the color of the mucous internal surface from CCD endoscopic images. In this method, the spectral reflectance of the internal surface and the spectral distribution of the illumination are represented by a weighted sum of some functions given by the statistical analysis of the surface reflectances. Each weighting factor is estimated from sequential images captured by the CCD endoscope. The effectiveness of the proposed method is confirmed by a basic experiment using a CCD endoscope and color charts.

Citation Download Citation

Shin-ichiroh Kitoh, Takashi Obi, Masahiro Yamaguchi, and Nagaaki Ohyama "Color measurement of the mucous membrane using sequential endoscopic images", Proc. SPIE 3034, Medical Imaging 1997: Image Processing, (25 April 1997); https://doi.org/10.1117/12.274084

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KEYWORDS

Endoscopes

Charge-coupled devices

Endoscopy

Reflectivity

Reflection

Optical filters

Imaging systems

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